change sort to use ID, since it is guaranteed unique where created_at…

… is not and we are looking for a single unique record

lib/friendly_id/history.rb

@@ -95,7 +95,7 @@ def first_by_friendly_id(id)
       end
 
       def slug_table_record(id)
-        select(quoted_table_name + '.*').joins(:slugs).where(slug_history_clause(id)).order(Slug.arel_table[:created_at].desc).first
+        select(quoted_table_name + '.*').joins(:slugs).where(slug_history_clause(id)).order(Slug.arel_table[:id].desc).first
       end
 
       def slug_history_clause(id)